Custom Unit Converter

Create and save your own custom unit conversions for specialized or personal measurement systems

Define Custom Units

First Unit Name:

Second Unit Name:

Conversion Factor (1 First Unit = ? Second Unit):

Enter how many second units equals one first unit.

Unit Description (Optional):

Save This Unit Set (Optional):

Convert Values

From (First Unit):

To (Second Unit):

Conversion Formula:

Unit B = Unit A × 1

Units Library

Fathom to Meter

1 Fathom = 1.8288 Meter

A fathom is a unit of length equal to 6 feet (1.8288 meters)...

Furlong to Meter

1 Furlong = 201.168 Meter

A furlong is a measure of distance equal to 220 yards (201.1...

Light Year to Kilometer

1 Light Year = 9460730472580.8 Kilometer

A light year is the distance that light travels in one year,...

Tsubo to Square Meter

1 Tsubo = 3.3058 Square Meter

Tsubo is a traditional Japanese unit of area, equal to appro...

Smoot to Meter

1 Smoot = 1.7018 Meter

A smoot is a nonstandard unit of length created as part of a...

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Custom Unit Relationship

Unit A

Unit B

Conversion Factor:

1Unit A=1.000000Unit B

First unit is equal than second unit

Similar relationships:

No similar common relationships

Customize your own units and define how they relate to each other.

About Custom Units

This converter lets you define and work with your own custom units and conversion factors. Useful for specialized fields, historical units, or personal measurement systems.

Examples of custom unit conversions:

Historical units (e.g., Roman cubits to meters)
Industry-specific units (e.g., points in typography)
Regional units (e.g., tsubo to square meters)
Creative units (e.g., "time to walk" vs. distance)

Historical Units

Ancient and historical units often vary by region and time period:

Roman Cubit: ~444.5 mm (1.458 ft)
Egyptian Royal Cubit: ~523.5 mm (1.718 ft)
Greek Stadion: ~185 m (607 ft)
Roman Mile: 1,480 m (4,856 ft)
Chinese Li: ~500 m (1,640 ft)

Note: Historical units often had regional variations and changed over time.

Tips for Creating Custom Units

1. Define a clear relationship - Make sure the conversion factor is precise

2. Add a description - Context helps understand what the unit represents

3. Use consistent names - Be clear about what your units measure

4. Consider the scale - Make sure units are appropriate for what you're measuring

5. Save your units - Create a library of units you use frequently

About the Custom Unit Converter

Create and save your own custom unit conversions for specialized or personal measurement systems All conversions run instantly in your browser and nothing you enter is sent to a server.

Common Conversion Formulas

From	To	Formula
Linear Conversion	Source Unit, Conversion Factor	Target Unit = Source Unit × Conversion Factor
Offset Conversion	Source Unit, Factor, Offset	Target Unit = (Source Unit × Factor) + Offset
Custom Unit Chain	Multiple Conversion Steps	Final Unit = ((Source Unit × Factor₁) + Offset₁) × Factor₂ + Offset₂
Dimensional Analysis	Compound Units (Area, Volume, etc.)	Target = Source × (Conversion Factor)ⁿ (where n = dimension)